[1] Jarník V.: Linear Dependence of Functions of One Real Variable. Čas. pěst. mat. 80 (1955), pp. 32-43 (Czech; French and Russian Summaries).
[2] Whitney H.:
Analytic Extensions of Differentiable Functions Defined in Closed Sets. TAMS 36 (1934), pp. 63-89.
MR 1501735 |
Zbl 0008.24902